diff options
Diffstat (limited to 'net/ipv4/af_inet.c')
| -rw-r--r-- | net/ipv4/af_inet.c | 1188 |
1 files changed, 1188 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c new file mode 100644 index 0000000..c34dab6 --- /dev/null +++ b/net/ipv4/af_inet.c @@ -0,0 +1,1188 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * PF_INET protocol family socket handler. + * + * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ + * + * Authors: Ross Biro, <bir7@leland.Stanford.Edu> + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Florian La Roche, <flla@stud.uni-sb.de> + * Alan Cox, <A.Cox@swansea.ac.uk> + * + * Changes (see also sock.c) + * + * piggy, + * Karl Knutson : Socket protocol table + * A.N.Kuznetsov : Socket death error in accept(). + * John Richardson : Fix non blocking error in connect() + * so sockets that fail to connect + * don't return -EINPROGRESS. + * Alan Cox : Asynchronous I/O support + * Alan Cox : Keep correct socket pointer on sock + * structures + * when accept() ed + * Alan Cox : Semantics of SO_LINGER aren't state + * moved to close when you look carefully. + * With this fixed and the accept bug fixed + * some RPC stuff seems happier. + * Niibe Yutaka : 4.4BSD style write async I/O + * Alan Cox, + * Tony Gale : Fixed reuse semantics. + * Alan Cox : bind() shouldn't abort existing but dead + * sockets. Stops FTP netin:.. I hope. + * Alan Cox : bind() works correctly for RAW sockets. + * Note that FreeBSD at least was broken + * in this respect so be careful with + * compatibility tests... + * Alan Cox : routing cache support + * Alan Cox : memzero the socket structure for + * compactness. + * Matt Day : nonblock connect error handler + * Alan Cox : Allow large numbers of pending sockets + * (eg for big web sites), but only if + * specifically application requested. + * Alan Cox : New buffering throughout IP. Used + * dumbly. + * Alan Cox : New buffering now used smartly. + * Alan Cox : BSD rather than common sense + * interpretation of listen. + * Germano Caronni : Assorted small races. + * Alan Cox : sendmsg/recvmsg basic support. + * Alan Cox : Only sendmsg/recvmsg now supported. + * Alan Cox : Locked down bind (see security list). + * Alan Cox : Loosened bind a little. + * Mike McLagan : ADD/DEL DLCI Ioctls + * Willy Konynenberg : Transparent proxying support. + * David S. Miller : New socket lookup architecture. + * Some other random speedups. + * Cyrus Durgin : Cleaned up file for kmod hacks. + * Andi Kleen : Fix inet_stream_connect TCP race. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/config.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/kernel.h> +#include <linux/major.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/fcntl.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/stat.h> +#include <linux/init.h> +#include <linux/poll.h> +#include <linux/netfilter_ipv4.h> + +#include <asm/uaccess.h> +#include <asm/system.h> + +#include <linux/smp_lock.h> +#include <linux/inet.h> +#include <linux/igmp.h> +#include <linux/netdevice.h> +#include <net/ip.h> +#include <net/protocol.h> +#include <net/arp.h> +#include <net/route.h> +#include <net/ip_fib.h> +#include <net/tcp.h> +#include <net/udp.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/raw.h> +#include <net/icmp.h> +#include <net/ipip.h> +#include <net/inet_common.h> +#include <net/xfrm.h> +#ifdef CONFIG_IP_MROUTE +#include <linux/mroute.h> +#endif + +DEFINE_SNMP_STAT(struct linux_mib, net_statistics); + +#ifdef INET_REFCNT_DEBUG +atomic_t inet_sock_nr; +#endif + +extern void ip_mc_drop_socket(struct sock *sk); + +/* The inetsw table contains everything that inet_create needs to + * build a new socket. + */ +static struct list_head inetsw[SOCK_MAX]; +static DEFINE_SPINLOCK(inetsw_lock); + +/* New destruction routine */ + +void inet_sock_destruct(struct sock *sk) +{ + struct inet_sock *inet = inet_sk(sk); + + __skb_queue_purge(&sk->sk_receive_queue); + __skb_queue_purge(&sk->sk_error_queue); + + if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { + printk("Attempt to release TCP socket in state %d %p\n", + sk->sk_state, sk); + return; + } + if (!sock_flag(sk, SOCK_DEAD)) { + printk("Attempt to release alive inet socket %p\n", sk); + return; + } + + BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); + BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); + BUG_TRAP(!sk->sk_wmem_queued); + BUG_TRAP(!sk->sk_forward_alloc); + + if (inet->opt) + kfree(inet->opt); + dst_release(sk->sk_dst_cache); +#ifdef INET_REFCNT_DEBUG + atomic_dec(&inet_sock_nr); + printk(KERN_DEBUG "INET socket %p released, %d are still alive\n", + sk, atomic_read(&inet_sock_nr)); +#endif +} + +/* + * The routines beyond this point handle the behaviour of an AF_INET + * socket object. Mostly it punts to the subprotocols of IP to do + * the work. + */ + +/* + * Automatically bind an unbound socket. + */ + +static int inet_autobind(struct sock *sk) +{ + struct inet_sock *inet; + /* We may need to bind the socket. */ + lock_sock(sk); + inet = inet_sk(sk); + if (!inet->num) { + if (sk->sk_prot->get_port(sk, 0)) { + release_sock(sk); + return -EAGAIN; + } + inet->sport = htons(inet->num); + } + release_sock(sk); + return 0; +} + +/* + * Move a socket into listening state. + */ +int inet_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + unsigned char old_state; + int err; + + lock_sock(sk); + + err = -EINVAL; + if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) + goto out; + + old_state = sk->sk_state; + if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) + goto out; + + /* Really, if the socket is already in listen state + * we can only allow the backlog to be adjusted. + */ + if (old_state != TCP_LISTEN) { + err = tcp_listen_start(sk); + if (err) + goto out; + } + sk->sk_max_ack_backlog = backlog; + err = 0; + +out: + release_sock(sk); + return err; +} + +/* + * Create an inet socket. + */ + +static int inet_create(struct socket *sock, int protocol) +{ + struct sock *sk; + struct list_head *p; + struct inet_protosw *answer; + struct inet_sock *inet; + struct proto *answer_prot; + unsigned char answer_flags; + char answer_no_check; + int err; + + sock->state = SS_UNCONNECTED; + + /* Look for the requested type/protocol pair. */ + answer = NULL; + rcu_read_lock(); + list_for_each_rcu(p, &inetsw[sock->type]) { + answer = list_entry(p, struct inet_protosw, list); + + /* Check the non-wild match. */ + if (protocol == answer->protocol) { + if (protocol != IPPROTO_IP) + break; + } else { + /* Check for the two wild cases. */ + if (IPPROTO_IP == protocol) { + protocol = answer->protocol; + break; + } + if (IPPROTO_IP == answer->protocol) + break; + } + answer = NULL; + } + + err = -ESOCKTNOSUPPORT; + if (!answer) + goto out_rcu_unlock; + err = -EPERM; + if (answer->capability > 0 && !capable(answer->capability)) + goto out_rcu_unlock; + err = -EPROTONOSUPPORT; + if (!protocol) + goto out_rcu_unlock; + + sock->ops = answer->ops; + answer_prot = answer->prot; + answer_no_check = answer->no_check; + answer_flags = answer->flags; + rcu_read_unlock(); + + BUG_TRAP(answer_prot->slab != NULL); + + err = -ENOBUFS; + sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); + if (sk == NULL) + goto out; + + err = 0; + sk->sk_no_check = answer_no_check; + if (INET_PROTOSW_REUSE & answer_flags) + sk->sk_reuse = 1; + + inet = inet_sk(sk); + + if (SOCK_RAW == sock->type) { + inet->num = protocol; + if (IPPROTO_RAW == protocol) + inet->hdrincl = 1; + } + + if (ipv4_config.no_pmtu_disc) + inet->pmtudisc = IP_PMTUDISC_DONT; + else + inet->pmtudisc = IP_PMTUDISC_WANT; + + inet->id = 0; + + sock_init_data(sock, sk); + + sk->sk_destruct = inet_sock_destruct; + sk->sk_family = PF_INET; + sk->sk_protocol = protocol; + sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; + + inet->uc_ttl = -1; + inet->mc_loop = 1; + inet->mc_ttl = 1; + inet->mc_index = 0; + inet->mc_list = NULL; + +#ifdef INET_REFCNT_DEBUG + atomic_inc(&inet_sock_nr); +#endif + + if (inet->num) { + /* It assumes that any protocol which allows + * the user to assign a number at socket + * creation time automatically + * shares. + */ + inet->sport = htons(inet->num); + /* Add to protocol hash chains. */ + sk->sk_prot->hash(sk); + } + + if (sk->sk_prot->init) { + err = sk->sk_prot->init(sk); + if (err) + sk_common_release(sk); + } +out: + return err; +out_rcu_unlock: + rcu_read_unlock(); + goto out; +} + + +/* + * The peer socket should always be NULL (or else). When we call this + * function we are destroying the object and from then on nobody + * should refer to it. + */ +int inet_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + + if (sk) { + long timeout; + + /* Applications forget to leave groups before exiting */ + ip_mc_drop_socket(sk); + + /* If linger is set, we don't return until the close + * is complete. Otherwise we return immediately. The + * actually closing is done the same either way. + * + * If the close is due to the process exiting, we never + * linger.. + */ + timeout = 0; + if (sock_flag(sk, SOCK_LINGER) && + !(current->flags & PF_EXITING)) + timeout = sk->sk_lingertime; + sock->sk = NULL; + sk->sk_prot->close(sk, timeout); + } + return 0; +} + +/* It is off by default, see below. */ +int sysctl_ip_nonlocal_bind; + +int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) +{ + struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; + struct sock *sk = sock->sk; + struct inet_sock *inet = inet_sk(sk); + unsigned short snum; + int chk_addr_ret; + int err; + + /* If the socket has its own bind function then use it. (RAW) */ + if (sk->sk_prot->bind) { + err = sk->sk_prot->bind(sk, uaddr, addr_len); + goto out; + } + err = -EINVAL; + if (addr_len < sizeof(struct sockaddr_in)) + goto out; + + chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); + + /* Not specified by any standard per-se, however it breaks too + * many applications when removed. It is unfortunate since + * allowing applications to make a non-local bind solves + * several problems with systems using dynamic addressing. + * (ie. your servers still start up even if your ISDN link + * is temporarily down) + */ + err = -EADDRNOTAVAIL; + if (!sysctl_ip_nonlocal_bind && + !inet->freebind && + addr->sin_addr.s_addr != INADDR_ANY && + chk_addr_ret != RTN_LOCAL && + chk_addr_ret != RTN_MULTICAST && + chk_addr_ret != RTN_BROADCAST) + goto out; + + snum = ntohs(addr->sin_port); + err = -EACCES; + if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) + goto out; + + /* We keep a pair of addresses. rcv_saddr is the one + * used by hash lookups, and saddr is used for transmit. + * + * In the BSD API these are the same except where it + * would be illegal to use them (multicast/broadcast) in + * which case the sending device address is used. + */ + lock_sock(sk); + + /* Check these errors (active socket, double bind). */ + err = -EINVAL; + if (sk->sk_state != TCP_CLOSE || inet->num) + goto out_release_sock; + + inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; + if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) + inet->saddr = 0; /* Use device */ + + /* Make sure we are allowed to bind here. */ + if (sk->sk_prot->get_port(sk, snum)) { + inet->saddr = inet->rcv_saddr = 0; + err = -EADDRINUSE; + goto out_release_sock; + } + + if (inet->rcv_saddr) + sk->sk_userlocks |= SOCK_BINDADDR_LOCK; + if (snum) + sk->sk_userlocks |= SOCK_BINDPORT_LOCK; + inet->sport = htons(inet->num); + inet->daddr = 0; + inet->dport = 0; + sk_dst_reset(sk); + err = 0; +out_release_sock: + release_sock(sk); +out: + return err; +} + +int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, + int addr_len, int flags) +{ + struct sock *sk = sock->sk; + + if (uaddr->sa_family == AF_UNSPEC) + return sk->sk_prot->disconnect(sk, flags); + + if (!inet_sk(sk)->num && inet_autobind(sk)) + return -EAGAIN; + return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); +} + +static long inet_wait_for_connect(struct sock *sk, long timeo) +{ + DEFINE_WAIT(wait); + + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + + /* Basic assumption: if someone sets sk->sk_err, he _must_ + * change state of the socket from TCP_SYN_*. + * Connect() does not allow to get error notifications + * without closing the socket. + */ + while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + if (signal_pending(current) || !timeo) + break; + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + return timeo; +} + +/* + * Connect to a remote host. There is regrettably still a little + * TCP 'magic' in here. + */ +int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, + int addr_len, int flags) +{ + struct sock *sk = sock->sk; + int err; + long timeo; + + lock_sock(sk); + + if (uaddr->sa_family == AF_UNSPEC) { + err = sk->sk_prot->disconnect(sk, flags); + sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; + goto out; + } + + switch (sock->state) { + default: + err = -EINVAL; + goto out; + case SS_CONNECTED: + err = -EISCONN; + goto out; + case SS_CONNECTING: + err = -EALREADY; + /* Fall out of switch with err, set for this state */ + break; + case SS_UNCONNECTED: + err = -EISCONN; + if (sk->sk_state != TCP_CLOSE) + goto out; + + err = sk->sk_prot->connect(sk, uaddr, addr_len); + if (err < 0) + goto out; + + sock->state = SS_CONNECTING; + + /* Just entered SS_CONNECTING state; the only + * difference is that return value in non-blocking + * case is EINPROGRESS, rather than EALREADY. + */ + err = -EINPROGRESS; + break; + } + + timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); + + if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { + /* Error code is set above */ + if (!timeo || !inet_wait_for_connect(sk, timeo)) + goto out; + + err = sock_intr_errno(timeo); + if (signal_pending(current)) + goto out; + } + + /* Connection was closed by RST, timeout, ICMP error + * or another process disconnected us. + */ + if (sk->sk_state == TCP_CLOSE) + goto sock_error; + + /* sk->sk_err may be not zero now, if RECVERR was ordered by user + * and error was received after socket entered established state. + * Hence, it is handled normally after connect() return successfully. + */ + + sock->state = SS_CONNECTED; + err = 0; +out: + release_sock(sk); + return err; + +sock_error: + err = sock_error(sk) ? : -ECONNABORTED; + sock->state = SS_UNCONNECTED; + if (sk->sk_prot->disconnect(sk, flags)) + sock->state = SS_DISCONNECTING; + goto out; +} + +/* + * Accept a pending connection. The TCP layer now gives BSD semantics. + */ + +int inet_accept(struct socket *sock, struct socket *newsock, int flags) +{ + struct sock *sk1 = sock->sk; + int err = -EINVAL; + struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); + + if (!sk2) + goto do_err; + + lock_sock(sk2); + + BUG_TRAP((1 << sk2->sk_state) & + (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); + + sock_graft(sk2, newsock); + + newsock->state = SS_CONNECTED; + err = 0; + release_sock(sk2); +do_err: + return err; +} + + +/* + * This does both peername and sockname. + */ +int inet_getname(struct socket *sock, struct sockaddr *uaddr, + int *uaddr_len, int peer) +{ + struct sock *sk = sock->sk; + struct inet_sock *inet = inet_sk(sk); + struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; + + sin->sin_family = AF_INET; + if (peer) { + if (!inet->dport || + (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && + peer == 1)) + return -ENOTCONN; + sin->sin_port = inet->dport; + sin->sin_addr.s_addr = inet->daddr; + } else { + __u32 addr = inet->rcv_saddr; + if (!addr) + addr = inet->saddr; + sin->sin_port = inet->sport; + sin->sin_addr.s_addr = addr; + } + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + *uaddr_len = sizeof(*sin); + return 0; +} + +int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, + size_t size) +{ + struct sock *sk = sock->sk; + + /* We may need to bind the socket. */ + if (!inet_sk(sk)->num && inet_autobind(sk)) + return -EAGAIN; + + return sk->sk_prot->sendmsg(iocb, sk, msg, size); +} + + +static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) +{ + struct sock *sk = sock->sk; + + /* We may need to bind the socket. */ + if (!inet_sk(sk)->num && inet_autobind(sk)) + return -EAGAIN; + + if (sk->sk_prot->sendpage) + return sk->sk_prot->sendpage(sk, page, offset, size, flags); + return sock_no_sendpage(sock, page, offset, size, flags); +} + + +int inet_shutdown(struct socket *sock, int how) +{ + struct sock *sk = sock->sk; + int err = 0; + + /* This should really check to make sure + * the socket is a TCP socket. (WHY AC...) + */ + how++; /* maps 0->1 has the advantage of making bit 1 rcvs and + 1->2 bit 2 snds. + 2->3 */ + if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ + return -EINVAL; + + lock_sock(sk); + if (sock->state == SS_CONNECTING) { + if ((1 << sk->sk_state) & + (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) + sock->state = SS_DISCONNECTING; + else + sock->state = SS_CONNECTED; + } + + switch (sk->sk_state) { + case TCP_CLOSE: + err = -ENOTCONN; + /* Hack to wake up other listeners, who can poll for + POLLHUP, even on eg. unconnected UDP sockets -- RR */ + default: + sk->sk_shutdown |= how; + if (sk->sk_prot->shutdown) + sk->sk_prot->shutdown(sk, how); + break; + + /* Remaining two branches are temporary solution for missing + * close() in multithreaded environment. It is _not_ a good idea, + * but we have no choice until close() is repaired at VFS level. + */ + case TCP_LISTEN: + if (!(how & RCV_SHUTDOWN)) + break; + /* Fall through */ + case TCP_SYN_SENT: + err = sk->sk_prot->disconnect(sk, O_NONBLOCK); + sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; + break; + } + + /* Wake up anyone sleeping in poll. */ + sk->sk_state_change(sk); + release_sock(sk); + return err; +} + +/* + * ioctl() calls you can issue on an INET socket. Most of these are + * device configuration and stuff and very rarely used. Some ioctls + * pass on to the socket itself. + * + * NOTE: I like the idea of a module for the config stuff. ie ifconfig + * loads the devconfigure module does its configuring and unloads it. + * There's a good 20K of config code hanging around the kernel. + */ + +int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + struct sock *sk = sock->sk; + int err = 0; + + switch (cmd) { + case SIOCGSTAMP: + err = sock_get_timestamp(sk, (struct timeval __user *)arg); + break; + case SIOCADDRT: + case SIOCDELRT: + case SIOCRTMSG: + err = ip_rt_ioctl(cmd, (void __user *)arg); + break; + case SIOCDARP: + case SIOCGARP: + case SIOCSARP: + err = arp_ioctl(cmd, (void __user *)arg); + break; + case SIOCGIFADDR: + case SIOCSIFADDR: + case SIOCGIFBRDADDR: + case SIOCSIFBRDADDR: + case SIOCGIFNETMASK: + case SIOCSIFNETMASK: + case SIOCGIFDSTADDR: + case SIOCSIFDSTADDR: + case SIOCSIFPFLAGS: + case SIOCGIFPFLAGS: + case SIOCSIFFLAGS: + err = devinet_ioctl(cmd, (void __user *)arg); + break; + default: + if (!sk->sk_prot->ioctl || + (err = sk->sk_prot->ioctl(sk, cmd, arg)) == + -ENOIOCTLCMD) + err = dev_ioctl(cmd, (void __user *)arg); + break; + } + return err; +} + +struct proto_ops inet_stream_ops = { + .family = PF_INET, + .owner = THIS_MODULE, + .release = inet_release, + .bind = inet_bind, + .connect = inet_stream_connect, + .socketpair = sock_no_socketpair, + .accept = inet_accept, + .getname = inet_getname, + .poll = tcp_poll, + .ioctl = inet_ioctl, + .listen = inet_listen, + .shutdown = inet_shutdown, + .setsockopt = sock_common_setsockopt, + .getsockopt = sock_common_getsockopt, + .sendmsg = inet_sendmsg, + .recvmsg = sock_common_recvmsg, + .mmap = sock_no_mmap, + .sendpage = tcp_sendpage +}; + +struct proto_ops inet_dgram_ops = { + .family = PF_INET, + .owner = THIS_MODULE, + .release = inet_release, + .bind = inet_bind, + .connect = inet_dgram_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = inet_getname, + .poll = udp_poll, + .ioctl = inet_ioctl, + .listen = sock_no_listen, + .shutdown = inet_shutdown, + .setsockopt = sock_common_setsockopt, + .getsockopt = sock_common_getsockopt, + .sendmsg = inet_sendmsg, + .recvmsg = sock_common_recvmsg, + .mmap = sock_no_mmap, + .sendpage = inet_sendpage, +}; + +/* + * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without + * udp_poll + */ +static struct proto_ops inet_sockraw_ops = { + .family = PF_INET, + .owner = THIS_MODULE, + .release = inet_release, + .bind = inet_bind, + .connect = inet_dgram_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = inet_getname, + .poll = datagram_poll, + .ioctl = inet_ioctl, + .listen = sock_no_listen, + .shutdown = inet_shutdown, + .setsockopt = sock_common_setsockopt, + .getsockopt = sock_common_getsockopt, + .sendmsg = inet_sendmsg, + .recvmsg = sock_common_recvmsg, + .mmap = sock_no_mmap, + .sendpage = inet_sendpage, +}; + +static struct net_proto_family inet_family_ops = { + .family = PF_INET, + .create = inet_create, + .owner = THIS_MODULE, +}; + + +extern void tcp_init(void); +extern void tcp_v4_init(struct net_proto_family *); + +/* Upon startup we insert all the elements in inetsw_array[] into + * the linked list inetsw. + */ +static struct inet_protosw inetsw_array[] = +{ + { + .type = SOCK_STREAM, + .protocol = IPPROTO_TCP, + .prot = &tcp_prot, + .ops = &inet_stream_ops, + .capability = -1, + .no_check = 0, + .flags = INET_PROTOSW_PERMANENT, + }, + + { + .type = SOCK_DGRAM, + .protocol = IPPROTO_UDP, + .prot = &udp_prot, + .ops = &inet_dgram_ops, + .capability = -1, + .no_check = UDP_CSUM_DEFAULT, + .flags = INET_PROTOSW_PERMANENT, + }, + + + { + .type = SOCK_RAW, + .protocol = IPPROTO_IP, /* wild card */ + .prot = &raw_prot, + .ops = &inet_sockraw_ops, + .capability = CAP_NET_RAW, + .no_check = UDP_CSUM_DEFAULT, + .flags = INET_PROTOSW_REUSE, + } +}; + +#define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) + +void inet_register_protosw(struct inet_protosw *p) +{ + struct list_head *lh; + struct inet_protosw *answer; + int protocol = p->protocol; + struct list_head *last_perm; + + spin_lock_bh(&inetsw_lock); + + if (p->type >= SOCK_MAX) + goto out_illegal; + + /* If we are trying to override a permanent protocol, bail. */ + answer = NULL; + last_perm = &inetsw[p->type]; + list_for_each(lh, &inetsw[p->type]) { + answer = list_entry(lh, struct inet_protosw, list); + + /* Check only the non-wild match. */ + if (INET_PROTOSW_PERMANENT & answer->flags) { + if (protocol == answer->protocol) + break; + last_perm = lh; + } + + answer = NULL; + } + if (answer) + goto out_permanent; + + /* Add the new entry after the last permanent entry if any, so that + * the new entry does not override a permanent entry when matched with + * a wild-card protocol. But it is allowed to override any existing + * non-permanent entry. This means that when we remove this entry, the + * system automatically returns to the old behavior. + */ + list_add_rcu(&p->list, last_perm); +out: + spin_unlock_bh(&inetsw_lock); + + synchronize_net(); + + return; + +out_permanent: + printk(KERN_ERR "Attempt to override permanent protocol %d.\n", + protocol); + goto out; + +out_illegal: + printk(KERN_ERR + "Ignoring attempt to register invalid socket type %d.\n", + p->type); + goto out; +} + +void inet_unregister_protosw(struct inet_protosw *p) +{ + if (INET_PROTOSW_PERMANENT & p->flags) { + printk(KERN_ERR + "Attempt to unregister permanent protocol %d.\n", + p->protocol); + } else { + spin_lock_bh(&inetsw_lock); + list_del_rcu(&p->list); + spin_unlock_bh(&inetsw_lock); + + synchronize_net(); + } +} + +#ifdef CONFIG_IP_MULTICAST +static struct net_protocol igmp_protocol = { + .handler = igmp_rcv, +}; +#endif + +static struct net_protocol tcp_protocol = { + .handler = tcp_v4_rcv, + .err_handler = tcp_v4_err, + .no_policy = 1, +}; + +static struct net_protocol udp_protocol = { + .handler = udp_rcv, + .err_handler = udp_err, + .no_policy = 1, +}; + +static struct net_protocol icmp_protocol = { + .handler = icmp_rcv, +}; + +static int __init init_ipv4_mibs(void) +{ + net_statistics[0] = alloc_percpu(struct linux_mib); + net_statistics[1] = alloc_percpu(struct linux_mib); + ip_statistics[0] = alloc_percpu(struct ipstats_mib); + ip_statistics[1] = alloc_percpu(struct ipstats_mib); + icmp_statistics[0] = alloc_percpu(struct icmp_mib); + icmp_statistics[1] = alloc_percpu(struct icmp_mib); + tcp_statistics[0] = alloc_percpu(struct tcp_mib); + tcp_statistics[1] = alloc_percpu(struct tcp_mib); + udp_statistics[0] = alloc_percpu(struct udp_mib); + udp_statistics[1] = alloc_percpu(struct udp_mib); + if (! + (net_statistics[0] && net_statistics[1] && ip_statistics[0] + && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1] + && udp_statistics[0] && udp_statistics[1])) + return -ENOMEM; + + (void) tcp_mib_init(); + + return 0; +} + +static int ipv4_proc_init(void); +extern void ipfrag_init(void); + +static int __init inet_init(void) +{ + struct sk_buff *dummy_skb; + struct inet_protosw *q; + struct list_head *r; + int rc = -EINVAL; + + if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) { + printk(KERN_CRIT "%s: panic\n", __FUNCTION__); + goto out; + } + + rc = proto_register(&tcp_prot, 1); + if (rc) + goto out; + + rc = proto_register(&udp_prot, 1); + if (rc) + goto out_unregister_tcp_proto; + + rc = proto_register(&raw_prot, 1); + if (rc) + goto out_unregister_udp_proto; + + /* + * Tell SOCKET that we are alive... + */ + + (void)sock_register(&inet_family_ops); + + /* + * Add all the base protocols. + */ + + if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) + printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); + if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) + printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); + if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) + printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); +#ifdef CONFIG_IP_MULTICAST + if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) + printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); +#endif + + /* Register the socket-side information for inet_create. */ + for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) + INIT_LIST_HEAD(r); + + for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) + inet_register_protosw(q); + + /* + * Set the ARP module up + */ + + arp_init(); + + /* + * Set the IP module up + */ + + ip_init(); + + tcp_v4_init(&inet_family_ops); + + /* Setup TCP slab cache for open requests. */ + tcp_init(); + + + /* + * Set the ICMP layer up + */ + + icmp_init(&inet_family_ops); + + /* + * Initialise the multicast router + */ +#if defined(CONFIG_IP_MROUTE) + ip_mr_init(); +#endif + /* + * Initialise per-cpu ipv4 mibs + */ + + if(init_ipv4_mibs()) + printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; + + ipv4_proc_init(); + + ipfrag_init(); + + rc = 0; +out: + return rc; +out_unregister_tcp_proto: + proto_unregister(&tcp_prot); +out_unregister_udp_proto: + proto_unregister(&udp_prot); + goto out; +} + +module_init(inet_init); + +/* ------------------------------------------------------------------------ */ + +#ifdef CONFIG_PROC_FS +extern int fib_proc_init(void); +extern void fib_proc_exit(void); +extern int ip_misc_proc_init(void); +extern int raw_proc_init(void); +extern void raw_proc_exit(void); +extern int tcp4_proc_init(void); +extern void tcp4_proc_exit(void); +extern int udp4_proc_init(void); +extern void udp4_proc_exit(void); + +static int __init ipv4_proc_init(void) +{ + int rc = 0; + + if (raw_proc_init()) + goto out_raw; + if (tcp4_proc_init()) + goto out_tcp; + if (udp4_proc_init()) + goto out_udp; + if (fib_proc_init()) + goto out_fib; + if (ip_misc_proc_init()) + goto out_misc; +out: + return rc; +out_misc: + fib_proc_exit(); +out_fib: + udp4_proc_exit(); +out_udp: + tcp4_proc_exit(); +out_tcp: + raw_proc_exit(); +out_raw: + rc = -ENOMEM; + goto out; +} + +#else /* CONFIG_PROC_FS */ +static int __init ipv4_proc_init(void) +{ + return 0; +} +#endif /* CONFIG_PROC_FS */ + +MODULE_ALIAS_NETPROTO(PF_INET); + +EXPORT_SYMBOL(inet_accept); +EXPORT_SYMBOL(inet_bind); +EXPORT_SYMBOL(inet_dgram_connect); +EXPORT_SYMBOL(inet_dgram_ops); +EXPORT_SYMBOL(inet_getname); +EXPORT_SYMBOL(inet_ioctl); +EXPORT_SYMBOL(inet_listen); +EXPORT_SYMBOL(inet_register_protosw); +EXPORT_SYMBOL(inet_release); +EXPORT_SYMBOL(inet_sendmsg); +EXPORT_SYMBOL(inet_shutdown); +EXPORT_SYMBOL(inet_sock_destruct); +EXPORT_SYMBOL(inet_stream_connect); +EXPORT_SYMBOL(inet_stream_ops); +EXPORT_SYMBOL(inet_unregister_protosw); +EXPORT_SYMBOL(net_statistics); + +#ifdef INET_REFCNT_DEBUG +EXPORT_SYMBOL(inet_sock_nr); +#endif |
